Instrument tower



FIG. 1 is a top, front, left perspective view of an instrument tower;

FIG. 2 is a front view of the instrument tower;

FIG. 3 is a rear view of the instrument tower;

FIG. 4 is a left-side elevation view of the instrument tower;

FIG. 5 is a right-side elevation view of the instrument tower;

FIG. 6 is a top plan view of the instrument tower; and,

FIG. 7 is a bottom plan view of the instrument tower.

In the drawings, the broken lines are for the purpose of illustrating portions of the instrument tower that form no part of the claimed design. 

CLAIM The ornamental design for an instrument tower, as shown and described. 